Signal detection method and system capable of improving laser radar detection distance and precision

Abstract

The invention belongs to the technical field of laser ranging, and particularly relates to a signal detection method and system capable of improving the laser radar detection distance and precision. According to the method, a photon counting technology and a weak signal detection technology are combined, and aperiodic multi-pulse averaging and autocorrelation detection are included; and the specific process is as follows: after a reflected light signal reaches a laser radar, stray light is filtered by a narrow-band optical filter, and then photon counting amplification is carried out by adopting a photon counting technology; non-periodic multi-pulse averaging is performed, namely multi-pulse cumulative averaging is performed according to a pulse period; and a pulse autocorrelation detection method is adopted to measure the time interval between the start pulse and the end pulse. The system comprises a pulse laser, a photon counter, a multi-time averaging module, an autocorrelation detector and the like. The multi-time averaging module is used for non-periodic multi-pulse averaging calculation, and the autocorrelation detector is used for autocorrelation operation to obtain a termination pulse signal. According to the invention, long-distance and high-precision target detection can be realized.

Description

technical field [0001] The invention belongs to the technical field of laser ranging, and in particular relates to a signal detection method and system which can improve the detection distance and accuracy of a laser radar. Background technique [0002] Long-distance ranging for non-cooperative targets has a large application space for astronomy, military and other scientific research fields, especially for applications in the field of aerospace detection, usually the ranging distance is large (hundreds of kilometers to tens of thousands of kilometers), so Most of the targets to be detected are space satellites without cooperative targets. Due to the diffuse reflection characteristics of satellites, the received ranging pulses are very weak and difficult to detect directly. Therefore, the ranging of non-cooperative satellites has become a hot spot in modern space exploration. [0003] For extended targets, the range equation for lidar is given by: [0004] [0005] In t...

AI Technical Summary

Problems solved by technology

Because the fast rising and falling edges of the pulse waveform contain rich high-order harmonic components, the narrow-band filter at the output stage of the lock-in amplifier will filter out these high-frequency components, resulting in distortion of the pulse waveform

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